Vulnerability · Published Oct 1, 2026 · Assigned by fedora
CVE-2026-103679Tnef: use-after-free and double-free in get_body_files() via multi-value body extraction
Medium 6.5
In plain English
A medium-severity use-after-free in tnef. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 79.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport Neutral Encapsulation Format (TNEF) file containing multiple message bodies. During extraction, improper memory management triggers a use-after-free and double-free condition, causing the application to crash and resulting in a Denial of Service (DoS).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tnef | no fix listed | DEBIAN-CVE-2026-103679 |
| Debian:13 | tnef | no fix listed | DEBIAN-CVE-2026-103679 |
| Debian:14 | tnef | no fix listed | DEBIAN-CVE-2026-103679 |
| Ubuntu:22.04:LTS | tnef | no fix listed | UBUNTU-CVE-2026-103679 |
| Ubuntu:24.04:LTS | tnef | no fix listed | UBUNTU-CVE-2026-103679 |
| Ubuntu:26.04:LTS | tnef | no fix listed | UBUNTU-CVE-2026-103679 |
| Ubuntu:26.10 | tnef | no fix listed | UBUNTU-CVE-2026-103679 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tnef | 0 – through 1.4.18 |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-103679 vdb-entry, x_refsource_REDHAT
- RHBZ#2544477 issue-tracking, x_refsource_REDHAT
- https://github.com/verdammelt/tnef